[release-branch.go1.21] runtime: add race annotations in IncNonDefault

Also use CompareAndSwap to make the code actually less racy.

Added a test which will be meaningful when run under the race
detector (tested it -race with broken fix in runtime, it failed).

This backport incorporates the correction in CL 551856,
using racereleasemerge instead of racerelease. 

Fixes #64757

Change-Id: I5972e08901d1adc8ba74858edad7eba91be1b0ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/549796
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit 3313bbb4055f38f53cd43c6c5782a229f445f230)
Reviewed-on: https://go-review.googlesource.com/c/go/+/550236
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
TryBot-Bypass: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2 files changed
tree: 89f6dd0ab66d61155cafb8717aa68e8bf0258f9a
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
README.md

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